A car starts at a position of x=7 m and has a speed of 2 mph. After 85 s the car has a speed of 28 mph. Determine the magnitude of the car's average acceleration during this time.

Answer 1

V1 = 2mi/h * 1600m/mi * 1h/3600s = m/s.
V2 = 28mi/h * 1600m/mi * 1h/3600s = m/s.

a = (V2 - V1)/t = m/s^2.